make running with Plug'n Play possible on node 13

.circleci/config.yml

@@ -7,7 +7,7 @@ docker_defaults: &docker_defaults
 
 macos_defaults: &macos_defaults
   macos:
-    xcode: "9.0"
+    xcode: "11.0"
   working_directory: ~/project/yarn
 
 attach_workspace: &attach_workspace
@@ -122,6 +122,16 @@ jobs:
           root: ~/project
           paths:
             - yarn
+  test-pkg-tests-linux-node13:
+    <<: *docker_defaults
+    docker:
+      - image: node:13
+    <<: *pkg_tests
+  test-pkg-tests-linux-node12:
+    <<: *docker_defaults
+    docker:
+      - image: node:12
+    <<: *pkg_tests
   test-pkg-tests-linux-node10:
     <<: *docker_defaults
     docker:
@@ -130,8 +140,20 @@ jobs:
   test-pkg-tests-linux-node8:
     <<: *docker_defaults
     <<: *pkg_tests
+  test-linux-node13:
+    <<: *docker_defaults
+    docker:
+      - image: node:13
+    <<: *test_steps
+  test-linux-node12:
+    <<: *docker_defaults
+    docker:
+      - image: node:12
+    <<: *test_steps
   test-linux-node10:
     <<: *docker_defaults
+    docker:
+      - image: node:10
     <<: *test_steps
   test-linux-node8:
     <<: *docker_defaults
@@ -155,7 +177,6 @@ jobs:
           name: Install Node 10
           command: |
             brew uninstall --ignore-dependencies node
-            brew update
             HOMEBREW_NO_AUTO_UPDATE=1 brew install node@10
             brew link --overwrite --force node@10
             [[ $(node --version) =~ ^v10\. ]]
@@ -177,6 +198,8 @@ jobs:
       - *test_run
   test-macos-node6:
     <<: *macos_defaults
+    macos:
+      xcode: "9.0"
     steps:
       - run:
           name: Install Node 6
@@ -248,6 +271,14 @@ workflows:
           filters: *default_filters
           requires:
             - install
+      - test-pkg-tests-linux-node13:
+          filters: *default_filters
+          requires:
+            - install
+      - test-pkg-tests-linux-node12:
+          filters: *default_filters
+          requires:
+            - install
       - test-pkg-tests-linux-node10:
           filters: *default_filters
           requires:
@@ -256,6 +287,14 @@ workflows:
           filters: *default_filters
           requires:
             - install
+      - test-linux-node13:
+          filters: *default_filters
+          requires:
+            - install
+      - test-linux-node12:
+          filters: *default_filters
+          requires:
+            - install
       - test-linux-node10:
           filters: *default_filters
           requires:
@@ -294,8 +333,12 @@ workflows:
             branches:
               ignore: /.*/
           requires:
+            - test-pkg-tests-linux-node13
+            - test-pkg-tests-linux-node12
             - test-pkg-tests-linux-node10
             - test-pkg-tests-linux-node8
+            - test-linux-node13
+            - test-linux-node12
             - test-linux-node10
             - test-linux-node8
             - test-linux-node6

CHANGELOG.md

@@ -4,10 +4,15 @@ Please add one entry in this file for each change in Yarn's behavior. Use the sa
 
 ## Master
 
+- Makes running scripts with Plug'n Play possible on node 13
+
+  [#7650](https://github.com/yarnpkg/yarn/pull/7650) - [**Sander Verweij**](https://github.com/sverweij)
+
 - Change run command to check cwd/node_modules/.bin for commands. Fixes run in workspaces.
 
   [#7151](https://github.com/yarnpkg/yarn/pull/7151) - [**Jeff Valore**](https://twitter.com/codingwithspike)
 
+
 ## 1.19.1
 
 **Important:** This release contains a cache bump. It will cause the very first install following the upgrade to take slightly more time, especially if you don't use the [Offline Mirror](https://yarnpkg.com/blog/2016/11/24/offline-mirror/) feature. After that everything will be back to normal.

azure-pipelines.yml

@@ -13,6 +13,10 @@ jobs:
 #        node_version: 8.x
       node_10_x:
         node_version: 10.x
+      node_12_x:
+        node_version: 12.x
+      node_13_x:
+        node_version: 13.x
 
   steps:
   - template: scripts/azure-run-tests.yml
@@ -30,6 +34,10 @@ jobs:
         node_version: 8.x
       node_10_x:
         node_version: 10.x
+      node_12_x:
+        node_version: 12.x
+      node_13_x:
+        node_version: 13.x
 
   steps:
   - template: scripts/azure-run-tests.yml
@@ -47,6 +55,10 @@ jobs:
         node_version: 8.x
       node_10_x:
         node_version: 10.x
+      node_12_x:
+        node_version: 12.x
+      node_13_x:
+        node_version: 13.x
 
   steps:
   - template: scripts/azure-run-tests.yml

src/util/generate-pnp-map-api.tpl.js

@@ -714,7 +714,7 @@ exports.setup = function setup() {
       return originalFindPath.call(Module, request, paths, isMain);
     }
 
-    for (const path of paths) {
+    for (const path of paths || []) {
       let resolution;
 
       try {